The Symbian OS has what I consider to the be the best Twitter application in the world.
It's called Gravity and its developer Janole has become something of a hero to me by keeping his users up to date on his latest activities on his twitter stream, and generally fighting the good fight for Symbian.
On the NexusOne there are many, many twitter applications. I have tried a few, here are my problems with them:
Failure to connect:
Several clients simply refuse to work on my data network the two best ones are:
Seesmic & Tweetcaster
Some clients worked but were overly reliant on the menu button, which kills it for me for example:
TwitterRide & Swift
The clients I use can thus be said to have run the gauntlet they are:
Twidroid: The old reliable of the android platform, Twidroid is a favourite of many users who have been using android since the G1 came out.
Twidroid can be relied upon to work, it's not pretty and the on-screen buttons are too damn small but it always works.
&
Twicca: My current favourite is the very dark and very cool Twicca. Twicca offers more customisation that almost any of the other options. It has a funny way of finding tweets but not loading them until you go to look at them. Sadly the buttons are still a bit small and the menu button is relied upon a bit too much for my liking. (You can sort of work around it with the back button).But when it comes right down to it Twicca is just beautiful, you can even colour-code your tweets.
I don't have root access to take a screenshot, so here is one from the web. (The developer is Japanese, so they have a big following in Asia).
